The key part is where the value of the COUCHBASE_URI environment variable is name of the Couchbase service. This allows the application deployed in WildFly to dynamically discovery the service and communicate with the database.

Now, new pods may be added as part of Couchbase service by scaling the replica set. Existing pods may be terminated or get rescheduled. But the Java EE application will continue to access the database service using the logical name.

This blog showed how a simple Java application can talk to a database using service discovery in Kubernetes.

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